Read/Write a table to/from a file with LabVIEW 7.1 - how?

[candidate]

I have a table (with numbers and strings in it) and I want to save the content of the table into a file and read it back later.

I managed to write the content into a file but I have problems reading it out. I use the "Write File.vi" with the Open and Close vis. Or should I better use the "write characters to file.vi"?

All the examples, which I found on ni.com, I cannot open, because I am using LabVIEW 7.1. I would be pleased if you could tell me where I can find an example for LabVIEW 7.1.

Greetings

Johannes

[Rupali]

Hello.. 🙂 Can you please mention in which file you are writing..? I mean in txt or in xls...? So it will be easy to answer... 🙂

Message Edited by Rupali on 09-24-2008 05:01 AM

[candidate]

Hi,

I don't mind what type of file it is to which I am writing the data. Currently I use a text-File, but if it makes things easier, I could also use an excel-file.

I attached my first try. Writing to file is more or less ok, but I don't know how to read it from the file. Just connecting the Read from File.vi to a local variable of the table (Sequence) does not work (Error says Connection not possible ... The type of the source is string. The type of the sink is 2-D array of string.)

Greetings

Johannes

Message Edited by candidate on 09-24-2008 06:23 AM

[Rupali]

Do you want to labview should create a file or you can create a file and then perform your task...? Is it OK for you to first create a file & then perform task...? 

[candidate]

Hi,

yes both is ok.

Best would be, if LabVIEW creates the file, if it does not exist. And if it exists, LabVIEW may overwrite it.

[Rupali]

Hey I have attached VIs where you have to create file first & then you can perform the task... Just have a look & try to modify it.. If you still have any problem let me know.. 🙂

Best luck.. 🙂

[candidate]

Hi,

thank you very much for your help.

Unfortunately my LabVIEW does not find some Subvi's in your example. Do I have to install something first? Do I need some specific dlls?

I've found another thread which is very similar to my problem: http://forums.ni.com/ni/board/message?board.id=170&message.id=232440&query.id=4057#M232440 

I used the attached example and modified my program. Now it is very simple. Have a look!

Greetings    Johannes

[candidate]

... and you need these vi's  😉

[Rupali]

Hello.. 🙂

So you got the answer... That's great.. 🙂

Best luck.. 🙂

Message Edited by Rupali on 09-26-2008 11:27 PM

[labviewleroy]

luck? where i'm going i don't need luck